<h2>What is Captcha</h2>

<p>CAPTCHA is an acronym for "Completely Automatic Public Turing Test to Tell Computers and Humans Apart". It is a task, that human can easily solve, but computer not.</p>

<p>It is used as a challenge-response to ensure that the individual submitting information is a human and not an automated process. Typically, a captcha is used with form submissions where authenticated users are not necessary, but you want to prevent spam submissions.</p>


<h2>What is Hooto Captcha</h2>
<p>hcaptcha is a free, easy-to-use WebService helps enterprises to integrate Captcha into their own business systems. Similar to Google reCaptcha but can be customized and deployment to your private network.</p>

<h3>Features</h3>
<ul>
<li><strong>High Security</strong>: using the distorted, bonding, dislocation and random word length, making it difficult to be dismantled, recognition by machine</li>
<li><strong>High Performance</strong>: Based on C/libevent/libgd/memcached, all levels of optimization, upto 500 Requests pre second in single-threaded (120x60 pixels)</li>
<li><strong>Local Deployment</strong>: Similar to Google reCaptcha but can deployment to private network</li>
<li><strong>Cluster Deployment</strong>： Support for large-scale network deployment <code>LVS -&gt; Hooto Captcha Cluster -&gt; Memcached Cluster</code></li>
</ul>

<h3>Example</h3>
<table border="0">
  <tr>
    <td>
      <img src="http://www.hooto.com/media/image/view/?id=950&style=full" />
    </td>
    <td>
      <img src="http://www.hooto.com/media/image/view/?id=951&style=full" />
    </td>
    <td>
      <img src="http://www.hooto.com/media/image/view/?id=952&style=full" />
    </td>
  </tr>
</table>

<h2>Project, WebService API</h2>
<ul>
<li><a href="https://github.com/eryx/hcaptcha" target="_blank">https://github.com/eryx/hcaptcha</a></li>
</ul>

<h2>Reference</h2>
<ul>
<li><a title="http://www.captcha.ru" href="http://www.captcha.ru" target="_blank">http://www.captcha.ru</a></li>
<li><a title="http://www.google.com/recaptcha" href="http://www.google.com/recaptcha" target="_blank">http://www.google.com/recaptcha</a></li>
</ul>

